Recuperator and block for building the same



A NIELSEN. RECUPERATOR AND BLOCK FOR BUILDING THE SAME.

APPLICATION FILED AUG.6,-l9l8.

1,329,471, Patented Feb. 3,1920.

' and containing the ALFRED NIELSEN, OF COPENHAGEN, DEN MARK.

REGUPERATOR AND BLOCK FOR BUILDING THE SAME.

Specification of Letters Patent.

Patented Feb. 3, 1920.

Application filed August 6, 1918. Serial No. 248,650.

To all whom it may concern:

Be it known that I, ALFRED NIELSEN, engine builder, subject of the King of Denmark, residing at Copenhagen, Denmark, have invented certain new and useful Improvements in Recuperators and Blocks for Building the Same, of which the following is a specification.

The present invention relates to recuperators with two sets of flues crossing one another and passed each by its own fluid, one being a hotter fluid and the other a colder one between which a transmission of heat is to take place. Such constructions are used, as is well known, especially in a great many furnace plants, in order to utilize the heat of the smoke, the smoke passing one of the sets of flues on its way to the chimney, while for instance the secondary combustion air is conducted through the other set of flues, thereby absorbing heat through the fluewalls from the smoke.

The invention consists in a special manner of constructing such recuperators, and in a block suited for that purpose.

The distinguishing feature of the recuperator here referred to is that the smoke flues are made of special fire-proof tubes, a single tube, or several tubes side by side, being supported in rectangular blocks of fireproof material piled close to one another, the said blocks being made hollow with cavities, communicating with one another through the sides of the blocks and encircling the tubes in a manner leaving their outer surface free as far as possible. Thus the cavities in the blocks form the second system of channels, crossing the smoke flues fluid whereto the heat 0 I the smoke is to be transmitted. The blocks may, suitably, be divided each in two halves, the plane of the joint passing through the axes of the tubes, whereby the placing in position of the latter will be facilitated.

ne manner of constructing the inven tion is illustrated on the drawing, where Figure 1 shows a portion of a cross-section of the recuperator.

Fig. 2 a corresponding portion of a longitudinal section of the same, while Fig. 3, at an enlarged scale, shows an element of the recuperator in cross-section along the line IIIIII of Fig. 4, and

Fig. 4 a longitudinal axial section of the recuperator element corresponding to Fig. 3.

Referring to the drawing, a are the smoke flues, flues are inserted. Each such block b is divided along a horizontal plane, through the tube-axis, in two congruous halves, a bottom part forming the support for the tube a and a top part covering the upper portion of the tube and supporting the block above. The joint 0 between the two halves of the block is not continuous, it being interrupted by the straight channels 03, d, extending clear out to the sides of the block and communicating with the semicircular channels 6, e, encircling the tube a. In the manner of construction shown, each block has two such transverse channels d, 6, but it may also be fitted with only one or with several such channels. Preferably there ought to be two channels in each block, as these may then easily be built together, with staggering joints in each course as well as in any two adjacent courses.

The lengths of tube forming the smokeflues a should be joined sufficiently tight, and the joints may, most suitably, be located, as shown on the drawing in special cavities f in the blocks, or in some of these. The drawing shows the joint made by means of a socket g on one of the pipe ends.

It is obvious that a recuperator of any length, width and height may be built by joining together a suflicient number of such block with tubes inserted therein, and the cross-channels may be arranged either horizontally or vertically, as desired, and the several tiers mayjbe interconnected either in series or in parallel, and this applies also to the smoke-flues.

While the blocks, when higher temperatures are in question, may be made of fireproof clay, the smoke-flues may be either of the same material (chamotte) or of stoneware, porcelain or other suitable material. If different materials be used simultaneously, and these have essentially diflerent coeflicients of expansion, due regard should be taken thereto in the arrangement of the tube joints. The tubes (1 may be of any suitable cross-section, round or polygonal. The blocks may be fitted with rabbets at their ends, in order to make a tighter joint.

aving now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. A structural unit for building recupera tors, with two independent sets of flues cross- Z) the rectangular blocks wherein the ing one another, comprising, in combination, a rectangular block having a central chamher, a tube coaxially disposed in said chamber and extending from end to end of the block, and orifices from said chamber opening opposite one another in opposite side walls of the block; p

2. A structural unit for building recuperators, with two independent sets of fines crossing one-another, comprising, in combination, a rectangular block having two chambers coaxially disposed in series, a tube coaxially placed in the said two chambers and extendfrom end to end of the block, and orifices from each of said chambers opening opposite one another in opposite side Walls of the block.

3. A structural unit such as is set forth in claim *2, and in which a transverse wall, which divides the block into the said two chambers coaxially disposed in series, is provided with a recess for accommodating the joint between two adjoining sections 01 the said tube.

ALFRED NIELSEN. 

